The United States and Japan will step up their defence cooperation to deal with the threat from nuclear-armed North Korea as tensions in East Asia remain high, officials from the two allies said on Thursday.

Vic MP Shaw apologises to parliament

Independent MP Geoff Shaw has "humbly and sincerely" apologised to the Victorian parliament after his suspension for misusing his parliamentary entitlements.

"I humbly and sincerely apologise to the house and to the people of Victoria for my breach of the code of conduct for members," Mr Shaw told parliament in a short prepared speech.

Mr Shaw said he understood the issue had been a distraction.

"I accept and I've always stated throughout the various investigations including a thorough and rigorous investigation by the Department of Public Prosecution, which found no wrongful action, that the buck stops with me, and I have taken full responsibility," Mr Shaw said.

Mr Shaw said he had always sought a conclusion to the matter.

"I genuinely apologise if my actions to date did not demonstrate such a commitment," he said.

"We are all elected to represent the best interests of our community and that has always been my sincere intention in Frankston.